DALLAS - The number of passengers going in and out of Dallas Love Field jumped 60 percent last month from June 2014 as the Dallas airport recorded more than 1 million passengers for the fourth straight month.

The year-over-year change was 0.5 percentage points larger than the May numbers, indicating that the traffic increases are flattening out.

The last big bump could come in August when Southwest Airlines adds 14 flights to its weekday schedule, going from 166 departures to 180.

The year-over-year increases have been steadily climbing as Southwest and Virgin America add more flights into and out of the Dallas airport, from an increase of 13.1 percent in October to last month’s 60 percent.

Airlines operated 10,830 flights in June, up 51 percent from June 2013.